package com.mmall.service.impl;

import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.CategoryMapper;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.Category;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.List;
import java.util.UUID;

/**
 * Created by zyc on 6/19/17.
 */
@Service("iUserService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private CategoryMapper categoryMapper;
    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("用户不存在");
        }


        String MD5Password = MD5Util.MD5EncodeUtf8(password);

        User user = userMapper.selectLogin(username, MD5Password);

        if (user == null) {
            return ServerResponse.createByErrorMessage("密码错误");
        }

        //防止返回对象里包含密码, 被窃取
        user.setPassword(StringUtils.EMPTY);

        return ServerResponse.createBySuccess("登录成功", user);
    }

    public ServerResponse<String> register(User user) {
        ServerResponse validResponse = this.checkValid(user.getUsername(), Const.USERNAME);
        if (!validResponse.isSuccess()) {
            return validResponse;
        }

        validResponse = this.checkValid(user.getEmail(), Const.EMAIL);
        if (!validResponse.isSuccess()) {
            return validResponse;
        }

        user.setRole(Const.Role.ROLE_CUSTOMER);

        //MD5 Encoding
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));

        int resultCount = userMapper.insert(user);
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("注册失败");
        }

        return ServerResponse.createBySuccessMessage("注册成功");
    }

    //检查有效性,包括 用户名有效性, 邮箱有效性
    public ServerResponse<String> checkValid(String str, String type) {

        if (StringUtils.isNotBlank(type)) {
            if (Const.USERNAME.equals(type)) {
                int resultCount = userMapper.checkUsername(str);
                if (resultCount > 0) {
                    return ServerResponse.createByErrorMessage("用户名已存在");
                }
            }

            if (Const.EMAIL.equals(type)) {
                int resultCount = userMapper.checkEmail(str);

                if (resultCount > 0) {
                    return ServerResponse.createByErrorMessage("邮箱已存在");
                }
            }
        } else {
            return ServerResponse.createByErrorMessage("参数错误");
        }
        return ServerResponse.createBySuccessMessage("校验成功");
    }

    public ServerResponse<User> logout(HttpSession session) {
        session.removeAttribute(Const.CURRENT_USER);
        return ServerResponse.createBySuccess();
    }


    //select Question By Username
    public ServerResponse selectQuestion(String username) {
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);


        if (validResponse.isSuccess()) {
            return ServerResponse.createByErrorMessage("用户不存在");
             /*
                    checkValid 是检查 xxx 有效性的
                    用户名
                    通过查找用户名是否存在.
                    如果存在 返回错误信息
                    不存在 返回成功

                    所以
                    如果他返回成功 那么说明用户是不存在的
                    如果返回失败, 说明用户已经存在
             */

        }

        String question = userMapper.selectQuestionByUsername(username);
        if (StringUtils.isNotBlank(question)) {
            return ServerResponse.createBySuccess(question);
        }
        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

    public ServerResponse<String> checkAnswer(String username, String question, String answer) {
        int resultCount = userMapper.checkAnswer(username, question, answer);
        if (resultCount > 0) {
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX + username, forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题的答案错误");
    }

    public ServerResponse<String> forgetRestPassword(String username, String passwordNew, String forgetToken) {
        if (StringUtils.isBlank(forgetToken)) {
            return ServerResponse.createByErrorMessage("参数错误,token需要传递");
        }

        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if (validResponse.isSuccess()) {
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX + username);

        if (StringUtils.isBlank(token)) {
            return ServerResponse.createByErrorMessage("token 无效或者已过期");
        }
        if (StringUtils.equals(forgetToken, token)) {
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int rowCount = userMapper.updatePasswordByUsername(username, md5Password);
            if (rowCount > 0) {
                return ServerResponse.createBySuccess("密码修改成功");
            }
        } else {
            return ServerResponse.createByErrorMessage("token错误,请重新获取重置密码的token");
        }
        return ServerResponse.createByErrorMessage("修改失败");
    }


    public ServerResponse<String> resetPassword(String passwordOld, String passwordNew, User user) {
        //防止横向越权,要校验一下这个用户的旧密码,一定要指定是这个用户.因为我们会查询一个count(1),如果不指定id,那么结果就是true啦count>0;
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld), user.getId());
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("旧密码错误");
        }
        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);

        if (updateCount > 0) {
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return ServerResponse.createByErrorMessage("密码更新失败");
    }


    public ServerResponse<User> updateInformation(User user) {
        //username
        //email
        int resultCount = userMapper.checkEmailByUserId(user.getEmail(), user.getId());
        if (resultCount > 0) {
            return ServerResponse.createByErrorMessage("email已存在,请更换email后再重试");
        }
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if (updateCount > 0) {
            return ServerResponse.createBySuccess("更新资料成功", updateUser);
        }
        return ServerResponse.createByErrorMessage("更新资料失败");
    }

    public ServerResponse<User> getInformation(Integer userId) {
        User user = userMapper.selectByPrimaryKey(userId);
        if (user == null) {
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    //backend

    /**
     * 校验是否是管理员
     *
     * @param user
     * @return
     */
    public ServerResponse checkAdminRole(User user) {
        if (user != null && user.getRole().intValue() == Const.Role.ROLE_ADMIN) {
            return ServerResponse.createBySuccess();
        }
        return ServerResponse.createByError();
    }


}
